Abstract
The development of the eggshell and the laying of eggs have been studied in two species of Conchostraca, Eoleptestheria ticinensis and Leptestheria dahalacensis. By a process of exocytosis the egg forms the vitelline envelope. This remains the only envelope from laying until hatching, thus also acquiring the functions of the eggshell. The mucous layer produced by the gonad wall glands, which then covers the eggs, only has the function of keeping the eggs together and does not protect them. Before laying, the epipodites of the central metameres of the thorax are modified in relation to the passage of the eggs inside them. The adaptation of the vitelline envelope to the eggshell function is discussed.
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